I was listening to an American firefighter on the radio the other day, He said that firefighters there have spent the last 50 - 70 years putting out small fires forest fires, leading to a massive build-up of fuel stores which, when a serious fire occurs, makes things cataclysmic.
Redwood forests before Europeans arrived burned every 6 to 25 years which, as the above chart shows, was far in excess of what's happening now.
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